1 . 在气象台正西方向
km处有一台风中心,它正向东北方向移动,移动速度的大小为
km/h,距台风中心
km以内的地区都将受到影响,若台风中心的这种移动趋势不变,大约________ 小时后气象台所在地开始受到影响(参考数据:
,
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b685c556cc423e4833c1dc671a134cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba8b563f340b8adef272a2499b23be5.png)
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2 . 某校数学建模社团对校外一座山的高度h(单位:
)进行测量,方案如下:如图,社团同学朝山沿直线行进,在前后相距a米两处分别观测山顶的仰角
和
(
),多次测量相关数据取平均值后代入数学模型求解山高,这个社团利用到的数学模型![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb70883828ee231b42167ca909d4f96.png)
___________ ;多次测量取平均值是中学物理测量中常用的减小误差的方法之一,对物理量进行n次测量,其误差
近似满足
,为使误差
在
的概率不小于0.9973,至少要测量___________ 次.参考数据:若占
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068198147fe773e52700b7609a8bed2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb70883828ee231b42167ca909d4f96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d8e0a088b964419617c5bae4b033bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb0e84cb91f01589e1995b331a7b0092.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d8e0a088b964419617c5bae4b033bb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6814d3993a9ff7100ccb592db3253e0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df7489d87e1386d08768827511ca821b.png)
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2021-05-16更新
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6卷引用:2021届吉林省长春市高三四模数学理科试题
2021届吉林省长春市高三四模数学理科试题宁夏石嘴山市2021届高三下学期三模数学(理)试题浙江省金华第一中学2024届高三下学期高考适应性测试数学试卷湖北省武汉市第二中学2023-2024学年高三下学期模拟考试(最后一卷)数学试卷(已下线)考点50 正态分布【理】-备战2022年高考数学典型试题解读与变式(已下线)专题3 “数学建模”类型
名校
3 . 如图,为了测量两山顶
,
间的距离,飞机沿水平方向在
,
两点进行测量,在
位置时,观察
点的俯角为
,观察
点的俯角为
;在
位置时,观察
点的俯角为
,观察
点的俯角为
,且
,则
,
之间的距离为________ .
![](https://img.xkw.com/dksih/QBM/2018/6/6/1961603365371904/2000955515543554/STEM/a2ea0ee144724ef6be14aa3f1bffb7b7.png?resizew=207)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c12aeebfa1af16f325c98a43bb08c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4279201a85e35fc3a3daa690a9b412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2018/6/6/1961603365371904/2000955515543554/STEM/a2ea0ee144724ef6be14aa3f1bffb7b7.png?resizew=207)
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2018-08-01更新
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1013次组卷
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2卷引用:吉林省长春市实验中学2022-2023学年高三上学期二模考试数学试题